Varying reports say you need to watch it on a computer or iOS mobile device with the Safari browser, as Apple suggests on its placeholder site. I'd be surprised if other up-to-date browsers didn't play it too, but you've been warned. You also can watch it on an Apple TV device, naturally.

The event gets underway at 10 a.m. Pacific. Given the likely product lineup, which also could include an updated iTunes and other software, the event could run up to a couple of hours.